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random.c
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1979-12-31
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11KB
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480 lines
/*
* This file contains the
* command processing functions for
* a number of random commands. There is
* no functional grouping here, for
* sure.
*/
#include <stdio.h>
#include "ed.h"
int tabsize; /* Tab size (0: use real tabs) */
/*
* Set fill column to n.
*/
setfillcol(f, n)
{
fillcol = n;
return(TRUE);
}
/*
* Display the current position of the cursor,
* in origin 1 X-Y coordinates, the character that is
* under the cursor (in octal), and the fraction of the
* text that is before the cursor. The displayed column
* is not the current column, but the column that would
* be used on an infinite width display. Normally this
* is bound to "C-X =".
*/
showcpos(f, n)
{
register LINE *clp;
register long nch;
register int cbo;
register long nbc;
register int cac;
register int ratio;
register int col;
register int i;
register int c;
register long nln;
register long thisln;
clp = lforw(curbp->b_linep); /* Grovel the data. */
nln =0;
for (cbo=nch=0;;++nch) {
if (clp==curwp->w_dotp && cbo==curwp->w_doto) {
thisln = nln+1L;
nbc = nch;
cac = (cbo==llength(clp)) ? '\n' : lgetc(clp,cbo);
}
if (cbo == llength(clp)) {
if (clp == curbp->b_linep)
break;
clp = lforw(clp);
cbo = 0;
nln++;
} else
++cbo;
}
col = getccol(FALSE); /* Get real column. */
ratio = 0; /* Ratio before dot. */
if (nch)
ratio = (100L*nbc) / nch;
mlwrite("X=%d Y=%d line=%D CH=0x%x .=%D (%d%% of %D)",
col+1, currow+1, thisln, cac, nbc, ratio, nch);
return (TRUE);
}
/*
* Return current column. Stop at first non-blank given TRUE argument.
*/
getccol(bflg)
int bflg;
{
register int c, i, col;
for (col=i=0; i<curwp->w_doto; ++i,col++) {
c = lgetc(curwp->w_dotp, i);
if (c!=' ' && c!='\t' && bflg)
break;
if (c == '\t')
col |= 0x07;
else if (c<0x20 || c==0x7F)
++col;
}
return(col);
}
/*
* Twiddle the two characters on either side of
* dot. If dot is at the end of the line twiddle the
* two characters before it. Return with an error if dot
* is at the beginning of line; it seems to be a bit
* pointless to make this work. This fixes up a very
* common typo with a single stroke. Normally bound
* to "C-T". This always works within a line, so
* "WFEDIT" is good enough.
*/
twiddle(f, n)
{
register LINE *dotp;
register int doto;
register int cl;
register int cr;
dotp = curwp->w_dotp;
doto = curwp->w_doto;
if (doto==llength(dotp) && --doto<0)
return (FALSE);
cr = lgetc(dotp, doto);
if (--doto < 0)
return (FALSE);
cl = lgetc(dotp, doto);
lputc(dotp, doto+0, cr);
lputc(dotp, doto+1, cl);
lchange(WFEDIT);
return (TRUE);
}
/*
* Quote the next character, and
* insert it into the buffer. All the characters
* are taken literally, with the exception of the newline,
* which always has its line splitting meaning. The character
* is always read, even if it is inserted 0 times, for
* regularity. Bound to "M-Q" (for me) and "C-Q" (for Rich,
* and only on terminals that don't need XON-XOFF).
*/
quote(f, n)
{
register int s;
register int c;
c = scr_ci() ;
if (n < 0)
return (FALSE);
if (!n)
return (TRUE);
if (c == '\n') {
do {
s = lnewline();
} while (s==TRUE && --n);
return (s);
}
return (linsert(n, c));
}
/*
* Set tab size if given non-default argument (n <> 1). Otherwise, insert a
* tab into file. If given argument, n, of zero, change to true tabs.
* If n > 1, simulate tab stop every n-characters using spaces.
* This has to be done in this slightly funny way because the
* tab (in ASCII) has been turned into "C-I" (in 10
* bit code) already. Bound to "C-I".
*/
tab(f, n)
{
if (n < 0)
return (FALSE);
if (!n || n > 1) {
tabsize = n;
return(TRUE);
}
if (! tabsize)
return(linsert(1, '\t'));
return(linsert(tabsize - (getccol(FALSE) % tabsize), ' '));
}
/*
* Open up some blank space. The basic plan
* is to insert a bunch of newlines, and then back
* up over them. Everything is done by the subcommand
* procerssors. They even handle the looping. Normally
* this is bound to "C-O".
*/
openline(f, n)
{
register int i;
register int s;
if (n < 0)
return (FALSE);
if (!n)
return (TRUE);
i = n; /* Insert newlines. */
do {
s = lnewline();
} while (s==TRUE && --i);
if (s == TRUE) /* Then back up overtop */
s = backchar(f, n); /* of them all. */
return (s);
}
/*
* Insert a newline. Bound to "C-M".
* If you are at the end of the line and the
* next line is a blank line, just move into the
* blank line. This makes "C-O" and "C-X C-O" work
* nicely, and reduces the ammount of screen
* update that has to be done. This would not be
* as critical if screen update were a lot
* more efficient.
* Newline has been changed to accomodate overwrite mode.
* If not at end of buffer cursor will be moved to beginning of next
* line, otherwise newlines will be inserted at the end of the buffer.
*/
newline(f, n)
{
if (n < 0)
return (FALSE);
/* if in insert mode then */
if (!(curbp->b_flag & BFOVRWRITE))
{
/* insert new lines */
insmodenewlin(f,n);
}
else
/* in overwrite mode */
{
/* move to existing lines, if at end insert new lines */
ovmodenewlin(f,n);
}
}
insmodenewlin(f,n)
{
int nicol;
register LINE *lp;
register int s;
while (n--)
{
lp = curwp->w_dotp;
if (llength(lp) == curwp->w_doto
&& lp != curbp->b_linep
&& !llength(lforw(lp)))
{
if ((s=forwchar(FALSE, 1)) != TRUE)
return (s);
}
else if ((s=lnewline()) != TRUE)
return (s);
}
return (TRUE);
}
ovmodenewlin(f,n)
{
int nicol;
register LINE *lp;
register int s;
while (n--)
{
lp = curwp->w_dotp;
/* if not at end of buffer */
if (lp != curbp->b_linep)
{
/* go to beginning of next line */
if ((s=forwline(f,1)) != TRUE)
return(s);
curwp->w_doto = 0;
}
else
/* otherwise */
{
/* insert newline at end of buffer */
if((s=lnewline()) != TRUE)
return(s);
}
return(TRUE);
}
}
/*
* Delete blank lines around dot.
* What this command does depends if dot is
* sitting on a blank line. If dot is sitting on a
* blank line, this command deletes all the blank lines
* above and below the current line. If it is sitting
* on a non blank line then it deletes all of the
* blank lines after the line. Normally this command
* is bound to "C-X C-O". Any argument is ignored.
*/
deblank(f, n)
{
register LINE *lp1;
register LINE *lp2;
register int nld;
lp1 = curwp->w_dotp;
while (!llength(lp1) && (lp2=lback(lp1))!=curbp->b_linep)
lp1 = lp2;
lp2 = lp1;
nld = 0;
while ((lp2=lforw(lp2))!=curbp->b_linep && !llength(lp2))
++nld;
if (!nld)
return (TRUE);
curwp->w_dotp = lforw(lp1);
curwp->w_doto = 0;
return (ldelete(nld));
}
/*
* Insert a newline, then enough
* tabs and spaces to duplicate the indentation
* of the previous line. Assumes tabs are every eight
* characters. Quite simple. Figure out the indentation
* of the current line. Insert a newline by calling
* the standard routine. Insert the indentation by
* inserting the right number of tabs and spaces.
* Return TRUE if all ok. Return FALSE if one
* of the subcomands failed. Normally bound
* to "C-J".
*/
indent(f, n)
{
register int nicol;
register int c;
register int i;
if (n < 0)
return (FALSE);
while (n--) {
for (nicol=i=0; i<llength(curwp->w_dotp); ++i) {
c = lgetc(curwp->w_dotp, i);
if (c!=' ' && c!='\t')
break;
if (c == '\t')
nicol |= 0x07;
++nicol;
}
if (lnewline() == FALSE
|| ((i=nicol/8) && linsert(i, '\t')==FALSE)
|| ((i=nicol%8) && linsert(i, ' ')==FALSE))
return (FALSE);
}
return (TRUE);
}
/*
* Delete forward. This is real
* easy, because the basic delete routine does
* all of the work. Watches for negative arguments,
* and does the right thing. If any argument is
* present, it kills rather than deletes, to prevent
* loss of text if typed with a big argument.
* Normally bound to "C-D".
*/
forwdel(f, n)
{
if (n < 0)
return (backdel(f, -n));
if (f != FALSE) { /* Really a kill. */
if (!(lastflag&CFKILL))
kdelete();
thisflag |= CFKILL;
}
return (ldelete(n, f));
}
/*
* Delete backwards. This is quite easy too,
* because it's all done with other functions. Just
* move the cursor back, and delete forwards.
* Like delete forward, this actually does a kill
* if presented with an argument. Bound to both
* "RUBOUT" and "C-H".
*/
backdel(f, n)
{
register int s;
if (n < 0)
return (forwdel(f, -n));
if (f != FALSE) { /* Really a kill. */
if (!(lastflag&CFKILL))
kdelete();
thisflag |= CFKILL;
}
if ((s=backchar(f, n)) == TRUE)
s = ldelete(n, f);
return (s);
}
/*
* Kill text. If called without an argument,
* it kills from dot to the end of the line, unless it
* is at the end of the line, when it kills the newline.
* If called with an argument of 0, it kills from the
* start of the line to dot. If called with a positive
* argument, it kills from dot forward over that number
* of newlines. If called with a negative argument it
* kills backwards that number of newlines. Normally
* bound to "C-K".
*/
kill(f, n)
{
register int chunk;
register LINE *nextp;
if (!(lastflag&CFKILL)) /* Clear kill buffer if */
kdelete(); /* last wasn't a kill. */
thisflag |= CFKILL;
if (f == FALSE) {
if (!(chunk = llength(curwp->w_dotp)-curwp->w_doto)) chunk = 1;
} else if (!n) {
chunk = curwp->w_doto;
curwp->w_doto = 0;
} else if (n > 0) {
chunk = llength(curwp->w_dotp)-curwp->w_doto+1;
nextp = lforw(curwp->w_dotp);
while (--n) {
if (nextp == curbp->b_linep)
return (FALSE);
chunk += llength(nextp)+1;
nextp = lforw(nextp);
}
} else {
mlwrite("neg kill");
return (FALSE);
}
return (ldelete(chunk, TRUE));
}
/*
* Yank text back from the kill buffer. This
* is really easy. All of the work is done by the
* standard insert routines. All you do is run the loop,
* and check for errors. Bound to "C-Y". The blank
* lines are inserted with a call to "newline"
* instead of a call to "lnewline" so that the magic
* stuff that happens when you type a carriage
* return also happens when a carriage return is
* yanked back from the kill buffer.
*/
yank(f, n)
{
register int c;
register int i;
extern int kused;
if (n < 0)
return (FALSE);
while (n--) {
i = 0;
while ((c=kremove(i)) >= 0) {
if (c == '\n') {
if (insmodenewlin(FALSE, 1) == FALSE)
return (FALSE);
} else {
if (linsert(1, c) == FALSE)
return (FALSE);
}
++i;
}
}
return (TRUE);
}
/* toggle between the insert and overwrite modes */
togglemode()
{
/* if in overwrite mode */
if (curbp->b_flag & BFOVRWRITE)
/* change to insert mode */
curbp->b_flag &= ~BFOVRWRITE;
else
/* change from insert mode to overwrite mode */
curbp->b_flag |= BFOVRWRITE;
/* cause the mode line to be redisplayed */
curwp->w_flag |= WFMODE;
}